Obama attempted to move control of the Census Bureau from the Commerce Department to the White House, to be managed by then Chief of Staff Rahm Emmanuel. 6. Obama had provided under the radar amnesty to illegal immigrants by allowing ICE Director John Morton to prohibit ICE officers from enforcing US immigration laws.
The primary enzymes responsible for DNA replication are DNA polymerases. Understanding the activity and limitations of DNA polymerases help in making sense of why DNA replication occurs the way it does. Key points are: 1  Prokaryotic cells contain three different DNA polymerases.2  Each have slightly different activities.uring DNA replication a DNA double helix must unwind and separate so that DNA polymerase enzymes can use each single strand as a template for the synthesis of a new double strand. Strand separation is catalyzed by a Helicase enzyme.
The polymerase can only be extend the DNA as far as the locus of the first primer, producing DNA duplexes of a specific length. In all subsequent cycles amplification produces PCR products of a length specified by the loci of the two primers, and these PCR products soon outnumber the original target molecules.